<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    let week = prompt('请输入中文星期几（例：星期一）')

    switch (week) {
      case '星期一':
        alert('Monday')
        break;
        case '星期二':
        alert('Tuesday')
        break;
        case '星期三':
        alert('Wednesday')
        break;
        case '星期四':
        alert('Thursday')
        break;
        case '星期五':
        alert('Friday')
        break;
        case '星期六':
        alert('Saturday')
        break;
        case '星期日':
        alert('Sunday')
        break;
      default:
        alert('请按规定输入')
        break;
    }
  </script>
</body>
</html>